A pro-Trump political action committee released polling Thursday finding that Democratic Sen. Joe Donnelly would pay a political price in his home state of Indiana if he opposes the GOP tax reform effort.

America First Policies, a group run by former Trump campaign officials, found that 41 percent of Indiana voters would be less likely to vote for Donnelly if he opposed the tax plan, versus 33 percent who said they would be more likely.

President Trump won Indiana by nearly 20 percentage points.

"In states like Indiana, voters are keeping a close eye on their leaders in Congress and expecting them to support a tax reform plan that benefits middle America and the middle class," said Brian O. Walsh, the group's president.

"That would be wonderful," Trump said of Democratic support Wednesday in a tax reform speech in Harrisburg, Pa. "But sadly, the Democrats have become obstructionists."